Yes, all ammo varies, and sometimes your rifle will like something and shoot well, or totally hate a round, as you've found out. The creme de la creme of factory loaded match ammo is generally Federal's Gold Medal Match, which to be honest about my personal experience, is what my LaRue likes best, by far. It can be hard to find at times, expensive, or if you can get it over the internet and shipped to you, not all that bad. I say buy one box, see how it works for you. If it blows your mind, then you have a base line. Know what your rifle likes and try to find a good plinking round and a good round for accuracy.